Chemistry (states of matter 2)

Question 1

What happens when a solid is melting?

Answer 1

When a solid is heated, its particles gain more E and vibrate more. At m.p they vibrate so much that they break away from their position

Question 2

What happens when a liquid evaporates?

Answer 2

It happens at a T below b.p. Some particles have more E than others, so they have enough energy to escape and form a gas

Question 3

What happens when a liquid boils?

Answer 3

When heated, liquid particles gain more E and move faster. At the b.p, particles gain enough E to overcome the forces between them, breaking away to form a gas

Question 4

What happens when a gas condenses?

Answer 4

The atoms in a gas are cooled down to form bonds. The T which this happens it the same as its b.p

Question 5

What happens when a liquid freezes?

Answer 5

Atoms must be cooled down to turn from a liquid to a solid. Freezing point T=melting point T

Question 6

What happens during sublimation?

Answer 6

Some solids change directly from a solid to a gas, this is due to the weak forced of attraction holding the atoms in a solid

Question 7

What do pure substances have?

Answer 7

Sharp, definite melting and boiling point values